If it just "clicks" check starter cable. If you have an aftermarket alarm, make sure it's off. There are 2 or three ignition fuses under the hood and I think one or two on the left side dash panel at the door (open the door on driver side and you can see the plastic panel on the side of the dash directly in front of you) There maybe an Ignition relay under the hood (fuse panel) and one on the right side dash (same as left) To check the relays, it takes two people, one to turn the key and one to listen for the relay "click", if you hear it click, you have power and the relay is good. Check them all, the owners manual will give you all the exact fuse and relay locations. Beyond that, try and jump start the truck. Make sure all of your equipment is "off" Radio, A/C etc. then try and start, if the jumping vehicles RPM's drop, let them sit for a few minutes with the second vehicle running and try again. If it still won't start, and all the fuses and relays are good, you've got a bad cable from the red square batt box next to the alternator that runs to the starter, or a very loose cable, or a bad starter. I am not a mechanic, however I have owned 4 Yukons and my current one has 243k. I've seen all the quirks! (and fixed them all) Hope this helps

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Many possible causes....Too little info to make an intelligent suggestion. Try charging the problem vehicle's battery with jumper cables for 2 minutes with the supply vehicle running at fast idle (or about 1500-2000 RPM, if it is tachometer equipped) before you try to crank the problem vehicle on a cold morning. If it starts right up, you likely have a weak battery that needs replacing.

Turn ignition key to run position so that red & yellow idiot lights stay on. Leave in this position for 10 minutes. At first you should see theft light flashing then it will go to on. Then turn key to off. Then start vehicle.

Check to see if the security light is flashing. If it is turn the ignition on, but don't try to start it. let it set for ten minutes, do this three times with out taking the key out of the ignition. After the third time your vehicle should start. If not let me know and we can go from there.
Randy

Turn your key to the on position(do not start), then push the throttle pedal to the floor three times, turn of the ignition, wait a second or twothen start the engine, this should reset it. Works on the 2000 Tahoe LT 4WD

Turn on you headlights and have someone crank it. If batt is bad, the kights will dim. If you have a poor connection the lights will go out. Also, remove and clean the negative cable connection on the batt. Remove, clean and reinsta'' g lluck

Next time it won't start turn headlights on and see if they dim when you turn key to start, if they dim its most likely starter, if they don't dim possible starter switch, Have you tried to start it in neutral position? Try that, if it starts in neutral than its park neutral switch, if not could be starter switch, Just make sure you chk. all fuses and any relays associated with ignition first.